Improvement in sewing-machines



v 2 Sheets-Sheet I. J. CHASE.

Sewing Machine. No. 18,732. Patented 086.1, 1857.

UNITED STATES PATENT ()EFIcE.

JOEL CHASE, OF NEW YORK, N. Y.

IMPROVEMENT IN SEWING-MACHINES.

Specification forming part of Letters Patent No. 18,732, dated December1, 1857.

To all whom it may concern:

Be it known that I, JOEL CHASE, of the city, county, and State of NewYork, have invented certain new and useful Improvements in theFeedMotion of Sewing-lllachines, which I have described in the followingspecification and illustrated in the accompanying drawings withsufficient clearness to enable others of compepetent skill to make anduse my invention.

My invention consists in a certain combination and arrangement of parts,hereinafter described, for causing the needle to feed the cloth forward,as hereinafter more fully set forth.

In the accompanying drawings, Figure l is a perspective view of myimproved machine. Fi g. 2 is longitudinal sectional elevation. Fig. 3 isa plan of a part of the needle-arm.

A is the table on which the machine may be placed. 0 is the plate onwhich the cloth is laid. B is the main casting, which forms the frame ofthe machine. D is the main shaft, upon which the balance-wheel M and thecamwheel E are hung. F is a crank-pin for operating the machine. Thecam-wheel E is made with a waved or undulating rim to give motion to theneedle-arm G. The needle-ar1n is hung in a socket in the rock-shaft H,which is hung in bearings in the frame. This needlearm fits closely intothe socket inthe shaft, and is kept from turning by friction any fartherthan it is compelled to turn by the arm I, which is attached to thelower end of the part which fits into the socket. This arm is restrictedin its motion by the stop J, and also may be restricted in its oppositemotion by the lever K. It is also kept from moving more than a properdistance by the stop L in the socket.

The operation is as follows: As the needle is pressed down the arm I isthrown back against the lever K unless the lever is turned so as tothrow the foot of it back out of its way, as indicated in red lines inFig. 2. When the lever is in its present position, as the needledescends to its lowest point of descent the arm I strikes the lever Kand turns the shank of the arm J in the socket of the rock-shaft farenough to move the needle a sufficient distance to feed the cloth ashort stitch ahead. The needle rises nearly to its highest point beforethe lateral position of the needle is changed, when the arm I strikesthe stop J and moves the needle back to its former position. By throwingthe lower end of the lever K farther forward, thearm I is more limitedin its motion, and the cloth is, as a consequence, fed farther, themotion of the needle being greater. By moving the lever backward orforward, the length of the stitch may be increasedor diminished atpleasure. The cloth is held to the table by a spring-pad, N, in theusual way. Two bearings, O and I, astride the rim of the cam-wheel andgive motion to the needle-arn1 as the wheel is turned.

I claim The combination of the lever G, when hung on an axis in therock-shaft, with the lever I, when the motion thereof is limited by thestops, in the manner set forth, for the purpose of imparting the feedmotion to the needle.

JOEL CHASE.

